shared: add minimal firewall manipulation helpers for establishing NAT rules, using libiptc

1 files changed, 82 insertions, 0 deletions

diff --git a/src/shared/fw-util.h b/src/shared/fw-util.h
new file mode 100644
index 000000000..58b4c2024
--- /dev/null
+++ b/src/shared/fw-util.h
@@ -0,0 +1,82 @@
+/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
+
+#pragma once
+
+/***
+  This file is part of systemd.
+
+  Copyright 2015 Lennart Poettering
+
+  systemd is free software; you can redistribute it and/or modify it
+  under the terms of the GNU Lesser General Public License as published by
+  the Free Software Foundation; either version 2.1 of the License, or
+  (at your option) any later version.
+
+  systemd is distributed in the hope that it will be useful, but
+  WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+  Lesser General Public License for more details.
+
+  You should have received a copy of the GNU Lesser General Public License
+  along with systemd; If not, see <http://www.gnu.org/licenses/>.
+***/
+
+#include "in-addr-util.h"
+
+#ifdef HAVE_LIBIPTC
+
+int fw_add_masquerade(
+                bool add,
+                int af,
+                int protocol,
+                const union in_addr_union *source,
+                unsigned source_prefixlen,
+                const char *out_interface,
+                const union in_addr_union *destination,
+                unsigned destination_prefixlen);
+
+int fw_add_local_dnat(
+                bool add,
+                int af,
+                int protocol,
+                const char *in_interface,
+                const union in_addr_union *source,
+                unsigned source_prefixlen,
+                const union in_addr_union *destination,
+                unsigned destination_prefixlen,
+                uint16_t local_port,
+                const union in_addr_union *remote,
+                uint16_t remote_port,
+                const union in_addr_union *previous_remote);
+
+#else
+
+static inline int fw_add_masquerade(
+                bool add,
+                int af,
+                int protocol,
+                const union in_addr_union *source,
+                unsigned source_prefixlen,
+                const char *out_interface,
+                const union in_addr_union *destination,
+                unsigned destination_prefixlen) {
+        return -ENOTSUP;
+}
+
+static inline int fw_add_local_dnat(
+                bool add,
+                int af,
+                int protocol,
+                const char *in_interface,
+                const union in_addr_union *source,
+                unsigned source_prefixlen,
+                const union in_addr_union *destination,
+                unsigned destination_prefixlen,
+                uint16_t local_port,
+                const union in_addr_union *remote,
+                uint16_t remote_port,
+                const union in_addr_union *previous_remote) {
+        return -ENOSTUP;
+}
+
+#endif